Traditional tap/drill charts recommend drill diameters for each size of tapped hole. But, according to this article, these recommendations are based on the size holes that were typically produced by less-accurate tools and processes used in the past. This article suggests guidelines for producing holes that will, in turn, produce correctly sized tapped holes.
Imported from the CTE archive to seed discussion on MFGAxis.
Originally published on CTE: 1997-09-01
CTE source: https://ctemag.com/articles/know-what-youre-tapping/
Legacy path: /articles/know-what-youre-tapping